I've looked at this game a couple times over its development, and I quite like the cute dynamic between the Succubus and the MC (I usually play female).
One question I have is; is there planning for making the Succubus into a dominant and doing stuff to you? As in, you train them to dominate you, instead of you always being the one in the power position.
I'm happy to hear you've been enjoying their dynamic!
There will be more options and positions added where the player can steer Valerie into taking the dominant role in sex. It will probably take a few more updates for this to be fully implemented, but a dom/sub system is high on my list of priorities.